package 事务操作;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;

public class Transaction {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/db_jdbc_demo?characterEncoding=utf8&useSSL=false&serverTimezone=UTC";
        String user = "root";
        String pass="1234";
        Connection conn = null;
        Statement stmt =null;

        try {
            Class.forName("com.mysql.jdbc.Driver");
             conn=DriverManager.getConnection(url, user, pass);
             String sql1="update t_account set money = money -5000 where id=1";
            String sql2="update t_account set money = money +5000 where id=2";
             conn.setAutoCommit(false);
             stmt = conn.createStatement();
             int i = stmt.executeUpdate(sql1);
//             int x=5/0;
            int j = stmt.executeUpdate(sql2);
            if (i+j==2){
                System.out.println("转账成功！");
                conn.commit();
            }else {
                System.out.println("转账失败！");
            }
        } catch (Exception e) {
//            e.printStackTrace();
            System.out.println("转账出现异常！");

            try {
                conn.rollback();
            } catch (SQLException ex) {
                ex.printStackTrace();
            }
        }finally {

                try {
                    stmt.close();
                    conn.close();
                } catch (SQLException ex) {
                    ex.printStackTrace();
                }

            }
        }
    }

